The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2014
Filed:
Jun. 27, 2013
Crestcom, Inc., Scottsdale, AZ (US);
Ronald Duane McCallister, Scottsdale, AZ (US);
CrestCom, Inc., Scottsdale, AZ (US);
Abstract
A transmitter () generates a time-varying, detroughed, biasing signal () for an RF power amplifier () so that the RF power amplifier () is biased in accordance with an envelope tracking scheme. A trough-filling section () is responsive to an envelope tracking signal (), which in turn is responsive to a magnitude signal () extracted from a complex baseband communication signal (). The trough-filing section () includes a limiting stage () that forms a raw troughing signal () which expands the bandwidth of the envelope tracking signal (). A filtering stage () reduces the bandwidth of the raw troughing signal () to form a trough-filling signal () that is combined back into the envelope tracking signal () using a linear process that maintains the bandwidth of the envelope tracking signal ().